Sometimes it's really hard for me to orgasm, but i've never faked it.
There will be points during sex that I'm /almost/ there but I won't actually come, and start to go through my orgasm motions. But I don't view that as faking. My partner knows when I do, don't and almost get there.
He also knows that I don't always need one. I personally quite enjoy the intimacy of having sex with him, and thats pleasurable enough.
A huge part of good sex is being able to tell each other when sex was particularly good or not, and being able to guide each other to what feels the best.